High security lock and hasp

ABSTRACT

A high security lock to secure the eyes of a hasp and keeper. The lock is formed of a housing of short cylindrical shape and a rear closure plate, in locked breech-lock engagement, which together define a cavity to receive and enclose the hasp and keeper eyes. The housing contains a locking bolt in a transverse trough and contains two lock cores in separate chambers. One core is operable by a key inserted through a front access opening and drives a pivoted lever to actuate the bolt. The other core fits through an opening in the closure plate and blocks breech lock release. The openings and cavities of the housing open to the rear and are shaped to be formed by die cores, so that both the housing and closure may be made as castings requiring a minimum of machining. The lock and the hasp and keeper assembly interact to give high security. The lock encloses and closely embraces the eyes of the hasp and keeper and lies close against the pads of the hasp and keeper. The lock presents a rounded front surface to impede forceful attack, and shroud plates overlying the pads closely surround the rear edge of the lock. The shrouds and plates of the hasp meet those of the keeper at a separation plane offset from that of the eyes and of the door and its jamb.

14 1 Aug. 26, 1975 O United States Patent 1 Best [ 1 HIGH SECURITY LOCKAND HASP [76] Inventor: Walter E. Best, c/o Best Lock Corporation PO.Box 103, lndianpolis, 1nd. 46206 [22] Filed: Apr. 1, 1974 [21] Appl.No.: 456,557

Related US. Application Data [63] Continuation-in-part of Scr. No.309,761, Nov. 27,

1972, Pat. No. 3,820,360.

[52] US. Cl. 70/32; 70/6 [51] Int. Cl. E05B 67/36 [58] Field of Search70/2, 3, 4, 5, 6, 7, 8, 70/9,10, 11, 12,13, 23, 32, 33, 34, 54, 367,368, 369, 417; 292/281 [56] References Cited UNITED STATES PATENTS834,591 10/1906 Streams 70/6 1,814,646 7/1931 Terrill 70/6 1,866,9557/1932 Terrill.... 70/6 2,660,872 12/1953 Beach.... 70/32 3,820,3006/1974 Best 70/32 Primary Examiner-Robert L. Wolfe Attorney, Agent, orFirm]enkins, Hanley & Coffey [57] ABSTRACT A high security lock tosecure the eyes of a hasp and keeper. The lock is formed of a housing ofshort cylindrical shape and a rear closure plate, in locked breech-lockengagement, which together define a cavity to receive and enclose thehasp and keeper eyes. The housing contains a locking bolt in atransverse trough and contains two lock cores in separate cham bers. Onecore is operable by a key inserted through a front access opening anddrives a pivoted lever to actuate the bolt. The other core fits throughan opening in the closure plate and blocks breech lock release. Theopenings and cavities of the housing open to the rear and are shaped tobe formed by die cores, so that both the housing and closure may be madeas castings requiring a minimum of machining.

The lock and the hasp and keeper assembly interact to give highsecurity. The lock encloses and closely embraces the eyes of the haspand keeper and lies close againstthe pads of the hasp and keeper. Thelock presents a rounded front surface to impede forceful attack,- andshroud plates overlying the pads closely surround the rear edge of thelock. The shrouds and plates of the hasp meet those of the keeper at aseparation plane offset from that of the eyes and of the door and itsjamb.

HIGH SECURITY LOCK ANI) HASP BACKGROUND OF THE INVENTION This inventionis a continuation-in-part of my prior application. Ser. No. 309,761,filed Nov. 27., 1972, and now US. Pat. No. 3,820,360 and relates to anim proved construction of a high security round lock of the type theredisclosed. and a combination thereof with a hasp and keeper havingoverlying shroud plates arranged to protect the lock.

In this specification, the terms hasp and keeper" are used to designatetwo members or bars used to lock doors and the like, which haveforward-projecting, apertured eyes adapted to be locked together, as bya padlock. The hasp and keeper shown are fastened to the door structureby plates or pads. but other forms may be used. For convenience, thehasp is considered to be the door-mounted or movable plate while thekeeper is considered to be the frame-mounted or fixed plate. but suchplates may be reversed and may be used not only on swinging and slidingsingle doors. but also on double doors. and these terms are forconvenience only and are not to be construed as limiting.

In door-closed relationship, the eyes of the hasp and keeper projectfrom the face of the door structure in face-to-face parallel relation.It is common practice to lock such eyes with heavy padlocks. but thesehave not been wholly satisfactory. It has also been proposed, as in myco-pending application, to lock the eyes together with a round lockwhich encloses the projecting eyes. In my co-pending application. thehousing is formed of an inner lock body secured within a cup-shapedouter housing. The inner body requires machined and bored openings forthe lock bolt and other working parts.

It is the purpose of the present invention to provide a round lock ofthe type which encloses the projecting eyes. and hich provides a highdegree of security and is of relatively simple and inexpensiveconstruction. It is a further purpose of the present invention tocombine a lock of this type with a speeiallyformed hasp and keeperhaving overlying shroud plates which protect the lock from forced-entryattack and enhance the security provided.

SUMMARY OF THE INVENTION In accordance with the present invention, thelock body is formed of a onepiece main housing and a rear closure plate.These are held together by a rotatablyengaged retaining means. such as abreech lock, and preferably held against release by a key-removablelock-core so as to secure them against disassembly even when removedfrom the hasp and keeper. Both the housing and closure are shaped sothat their necessary openings may be made as cored openings in castingsand to require a minimum of maching. The main housing is preferablyformed as a rounded body with generally cylindrical side surfaces and arounded front, and with a recess in the rear for the closure. Thehousing and closure together define a rearward-open cavity offset fromthe center of the lock to receive and enclose the eyes of the hasp andkeeper. The rear face of the housing contains a transverse troughintersecting the eye cavity and closed by the closure. which contains aslidable lock bolt to lock the two eyes together. The housing containstwo chambers which receive key operated lock cores. One core is alock-operating core having a key plug connected to operate the bolt. and

operated by a key inserted through a front opening in the housing. Suchfirst core is wholly enclosed at the rear by the closure. The other coreextends into the housing from the rear through a registering opening inthe closure so as to block the closure plate against rotation to releaseit from the housing. The closure plate is preferably formed with ashallow flat cavity in its rear face. in which an operating lever ispivotally mounted to connect the operating core with the bolt.

To enhance the resistance of the lock to cutting and like forced-entryattack, the lock housing may be cored to receive hardened steel pins,and formed to receive hardened plates opposite one or both ends of thebolt.

The hasp and keeper provided in accordance with the present inventioncomprise pads to be secured to the door and the door frame. havingforward-projecting apertured eyes which in locking position lie inface-toface parallel relation for reception into the formed cavity inthe lock. Desirably, shroud plates overlie the pads of the hasp andkeeper and closely surround the rear edge of the lock to preventinsertion of a prying bar or the like behind the lock.

Desirably, the eyes are positioned at the meeting edges of the door anddoor jamb so as to have a common separation plane therewith, and theseparation plane between the meeting edges of the hasp and keeper padsis offset therefrom in the direction toward the door jamb. so that thehasp pad and shroud plate overlap the jamb. This allows the shroudplates to be symmetrical and places the eyes in an offset position inthe recess defined by the shroud plates to match the offset position ofthe eye-receiving cavity in the lock. The offset separation planesenhance security against cutting.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings illustratethe invention and show an exemplifying embodiment. In such drawings:

FIG. 1 is a horizontal section taken on the line ll of FIG. 3. showing alock in locked relation with a hasp and keeper. in accordance with theinvention;

FIG. 2 is a fragmental front elevation of the assembly shown in FIG. 1;

FIG. 3 is an isometric view of the hasp and keeper assembly, shown'inrelation to a door and a jamb;

FIG. 4 is a perspective view of the lock housing;

FIG. 5 is a perspective view of the lock closure plate;

FIG. 6 is a rear elevation of the locking housing with parts assembledtherein ready for application of the closure plate;

FIG. 7 is a section taken on the line 77 of FIG. 6, showing a section ofan assembled lock;

FIG. 8 is an isometric view of a key-removable core used in accordancewith the invention; and

FIG. 9 is a horizontal section, like FIG. 1, showing a modified assemblyarrangement. in which the pad plates of the hasp and keeper are mountedagainst the rear face of the door structure and the shroud plates aremounted against the front face of the door structure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The lock 10 shown inthe drawings comprises a housing 12 of generally circular cross-sectionwith a rounded front portion. closed at the rear by a closure l4 seatedin a recess in the housing. The lock defines a rearwardly open chamber16 to receive the forward projecting eyes 18 and 20 of a hasp 22 andkeeper 24, and contains a slidable bolt 26 which is shown in FIG. I inlocked position engaged in the apertures of the eyes 18 and 20.

The hasp and keeper are preferably as shown in FIGS. l3. The hasp 22 hasa rear pad fastened to a door 30, and the keeper 24 has a rear padfastened to a door jamb 32 or to a companion door. As shown in FIG. 3,the hasp 22 is formed of heavy metal plate of generally rectangularconfiguration, with a pair of slots 34 formed in its right edge todefine between them a tab which is apertured and bent forward to formthe eye 18 offset inward from the right edge of the hasp. The keeper 24is of similar metal plate, of generally rectangular configuration, butdoes not have notches 34 at its edge and instead is formed with aprojecting tab which is apertured and bent forward to form the eye 20offset outward from the left edge of the keeper.

A shroud plate 36 overlies the pad of the hasp 22, and is formed ofsimilar steel plate and rectangular configuration but has a semicircularcut-out 38 at its right edge. A similar shroud plate 40 overlies thekeeper pad 24, and this likewise has a semicircular cut-out 42. The twocut-outs are complementary so that the two shroud plates define acircular recess 44 which contains the rear end of the lock 10 when suchlock is in locked position as shown in FIG. 1.

As seen in FIGS. 2 and 3, the adjacent edges of the hasp assembly andkeeper assembly lie in closely spaced relation and define a separationslot 46 which is offset from the eyes 18 and 20. Preferably, the meetingfaces of the eyes 18 and 2() lie coplanar with the separation slot 48between the door and the jamb 32, while the separation slot 46 is offsettherefrom toward the keeper. This causes the upper and lower portions 33and of the hasp pad to project across the separation slot 48 between thedoor and jamb, and overlap the edge of the jamb 32. The separation slots46 and 48 are thus out of alignment so as to hinder insertion of a sawto saw the lock.

The hasp and keeper assemblies may be secured to the door andjamb bybolts. As shown, the hasp pad 22 and its overlying shroud plate 36 areprovided with registering bolt holes 50, and the holes in the plate 36are recessed and shaped to receive the heads and squared shanksofcarriage bolts 52. The squared shank portions of such bolts fit incomplementary squared portions of the holes 50 to prevent the bolts frombeing turned from the outside. In addition to two bolt holes 50, thehasp pad has a bolt hole 54 close to the base of the eye 18. This isprovided with a tapered seat to receive the flat head of a bolt 56, andsuch head lies at or below the face ofthe hasp pad 22 and partiallyunderlies the overlying shroud plate 36. The keeper assembly issimilarly mounted. It has two shaped and recessed bolt holes to receivecarriage bolts 53, and has a bolt hole 55 close to the base of? the eye20 to receive the flatheated bolt 57. The bolts;56 and 57 may be slottedas usual with flathead bolts or may be break-away bolts which originallyhave gripping projections which are broken off after the bolts'have beenset.

When a lock 10 is locked on the hasp and keeper, its cavity 16 totallyencloses and surrounds the eyes I8 and 20, and itsgbolt 26 is deadlockedthrough the apertures of those The rear edge of the housing 12 lieswithin the recess 44 defined by the shroud plates 36 and 40, and suchshroud plates closely surround the rear edge of the lock to preventinsertion of a pry bar or other tool between the lock and the hasp orkeeper. 5 The hasp and keeper assembly here shown may be made in a sizeand proportions for use with a lock as shown in my prior co-pendingapplication, Serial No. 309.761, but as here shown in preferably usedwith a lock 10 of the construction shown in FIGS. 4-8.

The lock shown in FIGS. 4-8 comprises the housing 12 and a closuremember 14, both of which are adapted to be made as precision castingsand to require a minimum of machining. The housing 12 is a solid body ofcircular cross-sections with a rounded front end. At the rear, it has ashort section 58 of truly cylindrical shape, and a longer forwardportion 60 of generally frusto conical configuration. The housing 12 isshaped to form a rearward-open rectangular eye-receiving cavity 16, anda transverse trough 62 forming a slideway for the bolt 26. At theforward end of such trough 62, it connects with a wider and deeper slot64 having a round bottom, which receives a pair of hardened steel plates66 lying across the end of the bolt 26 to prevent drilling the bolt.

The housing 12 also has a rearward-open chamber 68 to contain anoperating lock core 70. Such lock is preferably of the type shown inFIG. 8. This comprises a lock body of figure-8 shape having a lower lobecontaining a key plug 72, and an upper lobe which contains pin tumblers.The core includes a retaining lug 74 shown in projecting position inFIG. 8, which is adapted to be retracted into the body of the core byoperation of a special control key 76. The cavity 68 is of correspondingfigure-8 cross-section, and has clearance at the side for the lug 74. Asshown in FIG. 7, the lobe of the cavity 68 which contains the key plug72 extends forward from the main cavity 68 to provide a circular recess78, and extends therebeyond on a smaller diameter to provide a keyaccess opening through the front face of the housing 12. A hardenedsteel disc 82 is mounted in the recess 78 and the key access opening 80and is slotted to admit a key to the key plug 72.

The body of the housing 12 is also formed with a blind second cavity 84of figure-8 cross-section, to receive a second lock core 70 to retainthe closure 14 in place, as described below.

The rear of the housing 12 is formed with a generally circular recess 86to receive the closure plate 14. Such recess has a series ofcircumferentialIy-spaced rectangular notches 88 about its periphery. Thethick wall about the recess 86 and containing the notches 88 is machinedto undercut the material between the notches 88, so as to leave inwardlyprojecting lugs 90 for breech lock engagement with the closure plate 14which is seated in the recess 86. As shown in FIG. 5, the closure plate14 is a generally circular disc having projecting lugs 92 spaced aboutits periphery and arranged to register with the notches 88 of thehousing 12. The closure plate 14 contains an opening 96 which registerswith the cavity 16 in the housing 12 to admit the hasp and keeper eyes18 and 20 thereto. The closure also has an opening 98 of figure-8 shapepositioned to register with the cavity 84 of the housing 12 when theclosure plate is in locked position in the housing 12. The inner face ofthe closure 14 is formed with a shallow sector'shaped recess 100 toprovide clearance space for a throw lcvcr 102 for actuating the bolt 26.

For assemblying the closure plate 14 to the housing 12. the closure isinserted in the recess 86 at the rear of the housing I2, with the lugs92 of the closure entering the notches 88 of the housing. and theclosure is then rotated clockwise to carry the lugs 92 of the closureplate beneath the lugs 90 of the housing. Such rotation carries theopening 96 of the closure plate into registry with the eye-receivinghousing cavity 16. and carries the figure-8 opening 98 of the closureplate into registry with the figure-8 cavity 84. A core 70' is theninserted into the aligned opening 98 and cavity 84 and is secured inplace to prevent rotation of the closure from locked to unlockedposition.

For purposes of locking the core 70 in the aligned opening and cavity.the closure 14 is provided with a rearward projecting lug 104 at oneedge of the opening 98, at the intersection of the two lobes of thefigure-8 opening. Such lug I04 is of sufficient length so that when thecore 70' is inserted. the retaining lug 74 may be moved behind the endof the lug 104 to lock the core 70' in place in the opening and cavity.The lug I04 is shown in section in FIG. 6, at the lower side of cavity84 and at the intersection of the two lobes of the figure- 8 cavity.Since such lug 104 is on the closure which must rotate through 30 as itis assembled to the housing. it is necessary to provide a clearance pathfor movement of such lug 104 through 30. For this purpose. a roundednotch 106 is formed at the end of the figure-8 cross-section of thecavity 84 to provide for that 30 range of movement of the lug 104. Thenotch I06 needs to be only deep enough to clear the end of the lug I04.

The mechanism of the lock includes the housing 12 and the closure I4,shaped as described above. and provided with rotatably engageableretaining means such as the breech lock lugs 90 and 92 described. Italso includes other mechanism. as follows: The bolt 26 is slidablymounted in the trough 62 for movement between a locked position shown infull lines and a retracted position shown in dotted lines in FIG. 6. Itis moved between these two positions by the throw lever I02. which ispivoted on a pin 103 formed or inserted in the housing 12. and actuatedby a crank 106 received in a slot I07 in the lever. The crank is carriedby a throw member 108 positioned behind and driven by the key plug 72 ofthe locking core 70 mounted in the cavity 68 of the housing 12. The rearend of the key plug 72 is provided with two deep holes. which receivelegs 110 on the throw member 108. The throw lever I02 lies in theshallow recess I00 and is held in place by the closure 14. The lever hasa bent-over end 112 engaged in a circular notch 114 in the bolt 26. Withthis arrangement. operation of the key plug 72 with an operating keyinserted through the slotted disc 82 will rotate the throw member 108 tocarry its crank 106 from its full line position to its dotted lineposition in FIG. 6, and this will retract the bolt 26 from lockedposition to retracted position.

Assembly of the lock is as follows: A protective disc 82 is inserted inthe recess 78 at the bottom of the cavity 68. An operating core 70 isthen inserted with the key opening toward the disc 82. A throw memberI08 is then inserted in the rear of the key plug 72 of the operatingcore 70. A bolt 26 is laid in the trough 62, and a throw lever I02 isengaged over the pivot 103 with its bent-over end I12 engaged in thenotch of the bolt 26.

Protective plates 66 are then inserted in the cavity 64 at the end ofthe bolt trough 62.

With these parts in place. the closure plate -I4 is then inserted in therecess 86, with its breech-lock legs 92 in the notches 88 of the housing12 and with its coreretaining lug 104 in the dotted line position 104ashown in FIG. 6. The closure plate is then rotated clockwise to carrythe lug 104 to its position shown in section in FIG. 6. Such rotationcarries'the breech-lock lugs 90 and 92 into locking engagement andcarries the closure openings 96 and 98 into registry with the housing"cavities l6 and 84. A retaining core is then inserted in the registeringopening 98 and cavity 84. For this purpose, a control key 76 is insertedin the key plug 72 and rotated clockwise 15 to retract the retaining lug74 fromits projected position as shown in FIGI S. The core is theninserted to carry the lug 74 behind the rear end of the lug 104 on theclosure 14, and the control key is then turned in reverse rotation toproject the retaining lug 74 behind the lug 104, and this locks the core70' in place. The control key 76 is then withdrawn.

The lock can be disassembled only by using a control key 76 to retractthe retaining lug 74 and remove the retaining core 70' fromthe opening98 and cavity 84. Until this is done, the retaining core 70 preventsrotation of the closure 14 to an unlocked position.

Use of the lock to lock a hasp and keeper as shown in FIG. 1 is asfollows: With an operating key inserted through the guard disc 82, thekey plug 72 is rotated to retract the bolt 26 from its locked positionas shown in FIGS. 1 and 6. The lock 10 can then be installed orremovedfrom the eyes 18 and 20 of the hasp and keeper. \Vhen the lock has beeninstalled to the position shown in FIG. 1, the operating key is rotatedto advance the bolt 26 to its locking position, and the key is thenremoved. The lock housing then lies close against the face of the padportion of the hasp 22 and keeper 24, with its rear end positioned inthe recess formed by the shroud plates 36 and 40. Such plates closelysurround the lock to protect it from prying. The center of the lock isin the plane of the separation slot 46 between the hasp and keeper andsuch slot is offset from the door separation slot 48 so that the endportions 33 and 35 of the hasp overlap the door part which carries thekeeper. The combination provides a high degree of security.

The modified assembly shown in FIg. 9 is similar. In such modification,the hasp 22 is mounted with its pad against the inner face of the door130, and the keeper 24 is mounted against the inner face of thecompanion door 132. The shroud plates 36 and 40, instead of beingmounted against the faces of the hasp and keeper pads, are mountedagainst the front faces of the doors. In this case. the separation slot148 between the doors is coplanar with the slot 146 between the meetingedges of the hasp and keeper and their shroud plates. The edges of thedoors are cut away, as with part-cylindrical notches. so that togetherthey form a deep cylindrical recess I20 aligned with the cylindricalrecess defined by the shroud plates 36 and 40. This admits the lock 10to be inserted through the shroud plates 36 and 40 into engagement withthe eyes I8 and 20. and to be locked in place thereon as before. Thelock is then largely contained within the deep recess I20 and therebyfurther protected from forced-entry attack.

I claim:

l. A lock for locking a hasp eye and keeper eye projecting in adjacentparallel relation from the face ol door structure and having alignedtrans\erse shacklereceiving apertures, comprising:

a housing having rear openings and a rear closure for such housing. saidhousing and closure together forming a rearward-open cavity to receivethe projecting hasp and keeper eyes.

said housing having a transverse trough-shaped slideway formed in itsrear face in intersecting relation with said cavity and rearwardly opento receive a bolt therein,

a bolt retained in said slideway by said closure and movable between alocking position across said cavity to lock the eyes therein and aretracted release position.

a core chamber formed in said housing for the reception. from the rear.of an actuating lock core having a rotatable key plug, a key openingformed at the front of said chamber to admit a key to said plugs andactuating means connecting the bolt for actuation by said key plug andmounted for assembly from the rear of the housing and enclosure by saidclosure.

and retaining means for securing the closure in place.

2. A lock as in claim I in which said housing and closure havingrotatably-engaged retaining means there between for securing the closurein place. and a blocking element inserted in aligned openings in saidhousing and closure to prevent relative rotation of the closure andhousing to disengage said retaining means.

3. A lock as in claim 1 in which said actuating means includes a pivotedlever having its free end engaged with the bolt. and a crank engagedtherewith and operable by the key plug to swing the lever and therebyadvance and retract the bolt. I

4. A lock as in claim 3 in which the lever is mounted and swingable in ashallow cavity formed between the housing and the closure.

5. A lock as in claim 3 in which said actuating means includes a throwmember operable by said key plug and rotatable at the rear of said corechamber and having a crank thereon engaged with said pivoted lever.

6. A lock as in claim 2 in which said actuating means comprises a leverpivoted to said housing and extending across the rear face thereof intoengagement with said bolt. and a throw member actuated by said key plugand forming a crank engaged with said lever to pivot the same andthereby actuate the bolt. said closure overlying the lever and retainingthe same in operating position.

7. A lock as in claim 2 in which said aligned openings in said housingand closure are shaped to receive a retaining lock core, and saidblocking element is a lock core inserted therein and having akey-operated retaining lug engageable with a portion of said housing orclo sure to retain the core in place.

8. A lock as in claim 6 in which said aligned openings in said housingand closure are shaped to receive a retaining lock core, and saidlocking element is a lock core inserted therein and having akey-operated retaining lug engageable with a portion of said housing orclosure to retain the core in place.

9. A lock as in claim 7 in which said rotatablyengaged retaining meanscomprises breech locking lugs on said housing and closure. engageable bylimited rotation of the closure from an insertion position to a lockedposition in the housing. said closure having a projection thereonextending into the housing opening which receives the retaining lockcore to form a shoulder therein for engagement by said coreretaininglug. said housing opening being shaped to allow entry of said projectioninto said opening in insertion position of the closure and swingingmovement of the projection therein to its operative position uponrotation of the closure to its locked position.

10. A lock as in claim 1 in which the openings, cavity, and chambers inthe housing are open to the rear so as to be formed by \vithdrauablccores. and the housing is formed as a casting.

11. A lock as in claim 9 in which the openings, cavity. and chambers inthe housing are open to the rear so as to be formed by withdrawablecores. and the housing is formed as a casting.

1. A lock for locking a hasp eye and keeper eye projecting in adjacentparallel relation from the face of door structure and having alignedtransverse shackle-receiving apertures, comprising: a housing havingrear openings and a rear closure for such housing, said housing andclosure together forming a rearwardopen cavity to receive the projectinghasp and keeper eyes, said housing having a transverse trough-shapedslideway formed in its rear face in intersecting relation with saidcavity and rearwardly open to receive a bolt therein, a bolt retained insaid slideway by said closure and movable between a locking positionacross said cavity to lock the eyes therein and a retracted releaseposition, a core chamber formed in said housing for the reception, fromthe rear, of an actuating lock core having a rotatable key plug, a keyopening formed at the front of said chamber to admit a key to said plug,and actuating means connecting the bolt for actuation by said key plugand mounted for assembly from the rear of the housing and enclosure bysaid closure, and retaining means for securing the closure in place. 2.A lock as in claim 1 in which said housing and closure havingrotatably-engaged retaining means therebetween for securing the closurEin place, and a blocking element inserted in aligned openings in saidhousing and closure to prevent relative rotation of the closure andhousing to disengage said retaining means.
 3. A lock as in claim 1 inwhich said actuating means includes a pivoted lever having its free endengaged with the bolt, and a crank engaged therewith and operable by thekey plug to swing the lever and thereby advance and retract the bolt. 4.A lock as in claim 3 in which the lever is mounted and swingable in ashallow cavity formed between the housing and the closure.
 5. A lock asin claim 3 in which said actuating means includes a throw memberoperable by said key plug and rotatable at the rear of said core chamberand having a crank thereon engaged with said pivoted lever.
 6. A lock asin claim 2 in which said actuating means comprises a lever pivoted tosaid housing and extending across the rear face thereof into engagementwith said bolt, and a throw member actuated by said key plug and forminga crank engaged with said lever to pivot the same and thereby actuatethe bolt, said closure overlying the lever and retaining the same inoperating position.
 7. A lock as in claim 2 in which said alignedopenings in said housing and closure are shaped to receive a retaininglock core, and said blocking element is a lock core inserted therein andhaving a key-operated retaining lug engageable with a portion of saidhousing or closure to retain the core in place.
 8. A lock as in claim 6in which said aligned openings in said housing and closure are shaped toreceive a retaining lock core, and said locking element is a lock coreinserted therein and having a key-operated retaining lug engageable witha portion of said housing or closure to retain the core in place.
 9. Alock as in claim 7 in which said rotatably-engaged retaining meanscomprises breech locking lugs on said housing and closure, engageable bylimited rotation of the closure from an insertion position to a lockedposition in the housing, said closure having a projection thereonextending into the housing opening which receives the retaining lockcore to form a shoulder therein for engagement by said core-retaininglug, said housing opening being shaped to allow entry of said projectioninto said opening in insertion position of the closure and swingingmovement of the projection therein to its operative position uponrotation of the closure to its locked position.
 10. A lock as in claim 1in which the openings, cavity, and chambers in the housing are open tothe rear so as to be formed by withdrawable cores, and the housing isformed as a casting.
 11. A lock as in claim 9 in which the openings,cavity, and chambers in the housing are open to the rear so as to beformed by withdrawable cores, and the housing is formed as a casting.